Carrier multi zone rtu
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  1. #1
    Join Date
    Apr 2007
    Location
    lake grove, ny
    Posts
    59

    Carrier multi zone rtu

    Hey guys I'm working on a carrier multi zone rtu it's a 50me-040---520bc replaced the compressor on Friday tried to start it today and had no luck is there anyone on here that's had experience with these units been in the trade for almost ten years but I've never seen a unit like this before thanks for any help

  2. #2
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    938
    is there a call for cooling from the stat? did you check the control side voltage

  3. #3
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,718
    I had a similar unit the other day. I found a defective remote smoke detectot head.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  4. #4
    Join Date
    Apr 2007
    Location
    lake grove, ny
    Posts
    59
    Yes there a call from cooling on all 8 stats control voltage on the stat side is 25-28 volts I have 115-120v off my secondary transformer and 460-490v at my line voltage terminal block everything seems to be responding except I'm not getting power to the timer control board that brings the first compressor on and I don't think it's a smoke alarm indoor fan is still running

  5. #5
    Join Date
    Jul 2011
    Location
    East coast USA
    Posts
    938
    Quote Originally Posted by joeywrists View Post
    Yes there a call from cooling on all 8 stats control voltage on the stat side is 25-28 volts I have 115-120v off my secondary transformer and 460-490v at my line voltage terminal block everything seems to be responding except I'm not getting power to the timer control board that brings the first compressor on and I don't think it's a smoke alarm indoor fan is still running
    Economizer locking you out? safeties, low voltage fuse. compressor contactor coil bad. if something blew the compressor you may have other electrical issues...Timer board fried?

  6. #6
    Join Date
    Apr 2007
    Location
    lake grove, ny
    Posts
    59
    Not the Econ checked all the fuses and safety's don't think the timer board is fried just not getting voltage to it and from what I can tell its supposed to get it from this relay board that's got 4 relays on it but I think only one is for cooling and comp contactor is new

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